managed install reasons for failure
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If I recall correctly, McAfee Agent uses an MSI - although it may be wrapped in an EXE - so you can specify a verbose log for that:
msiexec /I [path_to_and_name_of_MSI] [other command line arguments] /l*v %WinDir%\TEMP\Install_McAfee_Agent.LOG
I don't know the iBoss Agent so I can't help you with that. I can't imagine that it wouldn't have the ability to create an installation log. Check the documentation/deployment guide.